<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>Document</title>
 	<style type="text/css">
		h1{
			color: red;
			background-color: yellow;
			font-size: 50px;
			font-weight: normal;
			font-style: italic;
			text-decoration: underline;
		}
 	</style>
</head>
<body>
	<h1>我是一个主标题</h1>
</body>
</html>